CN113539648A - Double-energy-saving intelligent transformer with three-dimensional roll iron core - Google Patents
Double-energy-saving intelligent transformer with three-dimensional roll iron core Download PDFInfo
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- CN113539648A CN113539648A CN202110774525.0A CN202110774525A CN113539648A CN 113539648 A CN113539648 A CN 113539648A CN 202110774525 A CN202110774525 A CN 202110774525A CN 113539648 A CN113539648 A CN 113539648A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/12—Two-phase, three-phase or polyphase transformers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
- H02P13/06—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by tap-changing; by rearranging interconnections of windings
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Abstract
The invention discloses a double-energy-saving three-dimensional roll iron core intelligent transformer, which comprises: the three-dimensional wound iron core transformer and the intelligent control system; the intelligent control system comprises an on-load tap changer, a control loop and a data acquisition circuit; a voltage regulating coil tap on the high-voltage side of the three-dimensional wound core transformer is connected with an on-load voltage regulating switch, the on-load voltage regulating switch is connected with a control loop, and the control loop is connected with a data acquisition circuit. According to the three-dimensional roll iron core intelligent transformer, the intelligent control system is added on the basis of the original three-dimensional roll iron core transformer, the data acquisition circuit acquires signals, the control loop generates control signals according to the acquired signals to control the action of the on-load voltage regulating switch, and the tapping of the transformer is directly regulated when the transformer runs, so that the transformer can provide constant output voltage within a standard range when the load changes, the power consumption is reduced, and the power consumption is greatly saved.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a double-energy-saving three-dimensional roll iron core intelligent transformer.
Background
With the development of the power industry and the improvement of agricultural power grid reconstruction projects in China, the phenomenon that the voltage at the tail end of the original power grid is lower is generally improved. However, the following problems arise:
the first is that: the voltage near the power transformation of the power grid is generally higher. At present, the voltage at the output end of a transformer is designed to be 400V according to the standard, but the voltage output by the transformer is constantly changed due to the load fluctuation of the voltage of a power grid line and the different distance of the line, the voltage rises to 420V which is a common phenomenon, and much waste is caused by the used electric quantity. Displaying according to data recorded by 10D-type voltage monitoring points in a certain area of two Yue Zhejiang provinces: the voltage ultra-high time reaches 50.5%, the ultra-low time reaches 1.4%, the qualified time is only 48.1%, and especially the voltage rises from 380V to 450V at the valley of the electric load, which is a common phenomenon, so that the loss in the power grid is increased and the qualified rate of the power supply quality is low. The power consumption of the enterprise power transformer and all related equipment is increased, the motor is often burnt out, the service life of the equipment is shortened, and the maintenance and repair cost is increased.
Secondly, the following steps: three unbalance phenomena of power utilization are serious, particularly, the load below a platform area is unstable, and when the three-phase load is in unbalanced operation, the neutral line has current to pass through. This not only causes losses in the phase lines, but also in the neutral line, which increases the losses in the network lines. When the three-phase load is operated under the unbalanced working condition, the distribution transformer loss is increased. Since the power loss of the distribution transformer varies with the degree of unbalance of the load.
Thirdly, the method comprises the following steps: in the years, with the increase of frequency converters and the access of photovoltaic power and wind power, the power grid is seriously polluted, and harmonic waves are seriously out of standard.
(1) The harmonic wave causes additional harmonic loss to elements in the utility grid, reduces the efficiency of power generation, transmission and electric equipment, and a large amount of 3-order harmonic wave can overheat the line and even cause fire when flowing through a neutral line.
(2) Harmonics affect the proper operation of various electrical devices. The effect of harmonics on the motor, apart from causing additional losses, can also produce mechanical vibrations, noise and overvoltages, which cause severe local overheating of the transformer. The harmonics cause overheating, insulation aging, and shortened life of the capacitor, cable, etc., to be damaged.
(3) The harmonics cause local parallel and series resonance in the utility grid, thus amplifying the harmonics, which greatly increases the hazards of (1) and (2) above, and even causes serious accidents.
(4) Harmonics can cause malfunctions in relay protection and automation and can cause inaccurate metering by electrical measuring instruments.
(5) Harmonic waves can generate interference on adjacent communication systems, and noise is generated on the light side, so that the communication quality is reduced; the serious person causes the residence to be lost, so that the communication system can not work normally.
Disclosure of Invention
The invention aims to provide a double-energy-saving three-dimensional roll iron core intelligent transformer aiming at the defects of the prior art, so that the output voltage of the transformer is ensured to be within a standard range, the electromagnetic balance principle is adopted, the three-phase unbalance phenomenon is improved, harmonic waves are inhibited, the power consumption is reduced, and the power consumption is saved.
The invention provides a double-energy-saving three-dimensional roll iron core intelligent transformer, which comprises: the three-dimensional wound iron core transformer and the intelligent control system;
the intelligent control system comprises an on-load tap changer, a control loop and a data acquisition circuit;
the voltage regulating coil tap of the high-voltage side of the three-dimensional wound core transformer is connected with the on-load voltage regulating switch, the on-load voltage regulating switch is connected with the control loop, and the control loop is connected with the data acquisition circuit.
Preferably, the control loop receives data output by the data acquisition circuit and generates a control signal for controlling the action of the on-load tap changer according to the data.
Preferably, when the data output by the data acquisition circuit shows that the output voltage of the intelligent transformer with the three-dimensional roll iron core is higher than a first threshold value, a control signal generated by the control loop is used for disconnecting the on-load tap changer so as to close the on-load tap changer with a lower gear; when the data output by the data acquisition circuit shows that the output voltage of the intelligent transformer with the three-dimensional roll iron core is lower than a second threshold value, the control signal generated by the control loop is used for breaking the on-load tap changer so as to close the on-load tap changer with a higher gear. The intelligent transformer of claim 1, wherein the three-dimensional wound core transformer has a three-phase symmetrical three-dimensional structure, three core legs of the three-dimensional wound core transformer are arranged in an equilateral triangle three-dimensional manner, and three magnetic circuits have the same length.
The intelligent transformer with double energy-saving three-dimensional wound cores according to claim 1, further comprising a safety protection system, wherein the safety protection system is connected with the three-dimensional wound core transformer and the intelligent control system; when the three-dimensional wound core transformer and the line in the intelligent control system have the problems of electric leakage, overload, short circuit, overvoltage, undervoltage and open phase, the safety protection system starts a protection program for cutting off the line.
Preferably, the safety protection system comprises a central processing unit, a voltage signal feedback circuit, a current signal feedback circuit, an analog-to-digital conversion circuit, a display circuit, a communication interface circuit, a remote control input circuit and a remote control output circuit;
the voltage signal feedback circuit and the current signal feedback circuit are both connected with the three-dimensional wound core transformer and the intelligent control system;
the voltage signal feedback circuit and the current signal feedback circuit are both connected with the communication interface circuit, and the communication interface circuit is connected with the analog-to-digital conversion circuit;
the communication interface circuit is also connected with the remote control input circuit;
the remote control input circuit, the display circuit and the remote control output circuit are all connected with the central processing unit.
Preferably, the intelligent control system is matched with a combined bypass disconnecting link.
According to the three-dimensional roll iron core intelligent transformer, the intelligent control system is added on the basis of the original three-dimensional roll iron core transformer, the data acquisition circuit acquires signals, the control loop generates control signals according to the acquired signals to control the action of the on-load voltage regulating switch, and the tapping of the transformer is directly regulated when the transformer runs, so that the transformer can provide constant output voltage within a standard range when the load changes, the power consumption is reduced, and the power consumption is greatly saved.
Drawings
FIG. 1 is a system structure diagram of a three-dimensional iron core-rolled intelligent transformer of the present invention;
FIG. 2 is a schematic diagram of the wiring of the voltage regulating coil of the transformer of the intelligent transformer with a three-dimensional rolled iron core of the invention;
FIG. 3 is a picture of a real object of the iron core of the intelligent transformer with a three-dimensional rolled iron core of the present invention;
fig. 4 is a schematic structural diagram of a safety protection system of the intelligent transformer with a three-dimensional rolled iron core according to the invention.
Description of reference numerals: 1. a three-dimensional wound core transformer; 11. a main oil tank; 111. a low voltage winding; 112. a high voltage main winding; 1121. a voltage regulating coil tap on the high-voltage side; 113. a voltage regulating winding; 1131. a wire outlet end; 2. an intelligent control system; 21. a switching device; 211. an on-load tap changer; 22. a control loop; 23. a data acquisition circuit; 3. a security protection system; 31. a central processing unit; 32. a voltage signal feedback circuit; 33. a current signal feedback circuit; 34. an analog-to-digital conversion circuit; 35. a display circuit; 36. a communication interface circuit; 37. a remote control input circuit; 38. and a remote control output circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, it is a system structure diagram of the three-dimensional wound core intelligent transformer of the present invention. The invention relates to a three-dimensional roll iron core intelligent transformer, which comprises a three-dimensional roll iron core transformer 1 and an intelligent control system 2, wherein:
the intelligent control system 2 comprises an on-load tap changer 211, a control loop 22 and a data acquisition circuit 23.
The voltage regulating coil tap 1121 at the high-voltage side of the three-dimensional wound core transformer 1 is connected with the on-load voltage regulating switch 211, the on-load voltage regulating switch 211 is connected with the control loop 22, and the control loop 22 is connected with the data acquisition circuit 23.
The data acquisition circuit 23 acquires parameters related to the grid lines and loads, including: electric energy data such as current, voltage, frequency, active power, reactive power, power factor, electric quantity, switching value and the like; the data acquisition circuit 23 uses the multifunctional data acquisition switch measurement unit to directly send the sampling data into the dual-port RAM through hardware, and then obtains corresponding data by correcting and calculating the acquired data, and communicates with other devices as required. The control loop 22 receives the data output by the data acquisition circuit 23 and generates a control signal according to the data, wherein the control signal is used for controlling the action of the on-load tap changer 211; that is, the control circuit 22 automatically selects the on-off state of the on-load tap changer 211 connected to each tap of the tap coils according to the software parameter setting, and the voltage fluctuation is within a certain range. On-load tap changers, also known as "on-load tap changers", allow direct regulation of the transformer tap while the transformer is in operation, so that the transformer is able to provide a constant voltage when the load changes. The basic principle is to realize the switching between taps in the transformer winding under the condition of ensuring that the load current is not interrupted, thereby changing the number of turns of the winding, namely the voltage ratio of the transformer, and finally realizing the purpose of voltage regulation. The actually adjusted voltage fluctuation range is set to be between the second threshold and the first threshold, namely, the voltage minimum value is the second threshold, and the voltage maximum value is the first threshold. When the data output by the data acquisition circuit shows that the output voltage of the transformer is higher than a first threshold value, a control signal generated by the control loop is used for switching off the current on-load tap changer and closing the on-load tap changer with a lower gear; when the data output by the data acquisition circuit shows that the output voltage of the transformer is lower than the second threshold value, the control signal generated by the control loop is used for switching off the current on-load tap changer and switching on the on-load tap changer with a higher gear.
Referring to fig. 2, it is a schematic diagram of the wiring of the voltage regulating coil of the transformer of the intelligent transformer with a three-dimensional rolled iron core of the present invention. Fig. 2 is a schematic diagram of an equivalent circuit of one phase of the transformer, and is not a schematic diagram of actual connection, in the actual connection, the tap of the voltage regulating coil and the on-load tap changer are not in the same cabinet, and a cable or a copper bar needs to be laid in the connection between the tap of the voltage regulating coil and the on-load tap changer. As shown in fig. 2, the main oil tank 11 of the three-dimensional wound core transformer includes a low voltage winding 111, a high voltage main winding 112, and a voltage regulating winding 113. The tap of the voltage control winding (i.e., the high-voltage side voltage control coil) is connected to the switching device 21. The switching device 21 comprises an inductor L and load tap changers KM1 and KM2 which are respectively connected with two ends of the inductor L, wherein KM1 is the load tap changer with a higher gear, and KM2 is the load tap changer with a lower gear. One end of the switch KM1 is connected with the inductor L, the other end (Q1) is connected with a tap of the regulating winding, one end of the switch KM2 is connected with the inductor L, and the other end (Q2) is connected with the tap of the regulating winding. In addition, the inductor L is also connected to the high voltage main winding 112. The inductance L here serves for the voltage regulation, which changes the excitation of the high-voltage main winding of the transformer. The control loop is set according to software parameters, and obtains a control signal through calculation, and the control signal controls the on-load tap changer which is automatically selected and connected with each tap of the voltage regulating coil to be switched on and off, so that the voltage fluctuation is in a certain range. When the output voltage of the transformer is overhigh, the control loop switches off the current on-load voltage regulating switch and closes the on-load voltage regulating switch with a lower gear; when the output voltage of the transformer is too low, the control loop switches off the current on-load tap changer and closes the on-load tap changer with a higher gear. In addition, a wire outlet 1131 is led out from the voltage regulating winding 113, and the wire outlet 1131 is one of two terminals of a phase winding of the transformer, which can be connected to a power supply or other winding taps, depending on the transformer group.
The three-dimensional iron core intelligent transformer of rolling up that this embodiment provided has added intelligent control system on original three-dimensional iron core transformer's basis, in this intelligent control system, data acquisition circuit gathers the signal, control circuit produces control signal according to the signal of gathering, be used for controlling on-load tap-changing switch's action, direct regulating transformer tapping when the transformer operation, make the transformer can provide the invariable output voltage within the standard range when the load changes, the power consumption is reduced, the power consumption has been saved greatly.
On the basis of the above embodiment, optionally, the three-dimensional wound core transformer has a three-phase symmetric three-dimensional structure, three core columns of the three-dimensional wound core transformer are arranged in an equilateral triangle three-dimensional manner, and the lengths of three magnetic circuits are consistent.
Referring to fig. 3, it is a picture of a real object of the iron core of the stereoscopic roll iron core intelligent transformer of the present invention. The magnetic conduction direction of the silicon steel strip of the three-dimensional wound core transformer is completely consistent with the magnetic circuit direction, the magnetic circuit has no gap, and the winding is tighter. Compared with the traditional planar laminated transformer, the planar laminated transformer has the advantages of low loss, low noise, more compact structure and material saving. If the product replaces the transformer with the laminated sheets S7 and S9 currently used in a power grid line, on one hand, the energy can be saved by more than 40% by adopting a three-dimensional wound core transformer; on the other hand, the intelligent control system is adopted to further realize load energy saving. That is to say, the three-dimensional iron core rolling intelligent transformer provided by the invention is a double-energy-saving power transformer. If the three-dimensional roll iron core intelligent transformer is adopted by enterprise power utilization, the power saving effect can reach 6% -35% according to different loads; if the power supply department adopts the intelligent transformer with the three-dimensional rolled iron core, the voltage qualification rate can be ensured to reach 100 percent, the radius of a power supply line can be further prolonged, the line loss is reduced, and the whole power grid works in a safe, economic and efficient operation state.
As a preferred embodiment, the three-dimensional wound core intelligent transformer provided by the present invention may further include a safety protection system. The safety protection system is connected with the three-dimensional wound core transformer and the intelligent control system.
Referring to fig. 4, it is a schematic structural diagram of the safety protection system of the stereoscopic roll core intelligent transformer of the present invention.
Specifically, the safety protection system may include a central processing unit 31, a voltage signal feedback circuit 32, a current signal feedback circuit 33, an analog-to-digital conversion circuit 34, a display circuit 35, a communication interface circuit 36, a remote control input circuit 37, and a remote control output circuit 38; the communication interface circuit 36 is a highway or a bridge in electrical control, and is connected with all devices to complete designated functions of monitoring, automatic control, protection and the like of the system. The voltage signal feedback circuit 32 and the current signal feedback circuit 33 are both connected with the three-dimensional wound core transformer 1 and the intelligent control system 2 and are used for acquiring voltage signals and current signals fed back by the three-dimensional wound core transformer 1 and the intelligent control system 2; the voltage signal feedback circuit 32 and the current signal feedback circuit 33 are both connected with the communication interface circuit 36; the communication interface circuit 36 is connected with the analog-to-digital conversion circuit 34, and the analog-to-digital conversion circuit 34 performs analog-to-digital conversion processing on the voltage signal and the current signal; the communication interface circuit 36 is also connected to a remote control input circuit 37; the remote control input circuit 37, the display circuit 35 and the remote control output circuit 38 are all connected with the central processing unit 31, and the remote control input circuit and the remote control output circuit complete the functions of monitoring signal input and control signal output required by remote control. In the actual processing process, the voltage signal feedback circuit 32 provides an instant voltage value, and the current signal feedback circuit 33 provides an instant current value; the voltage signal and the current signal are transmitted to the analog-to-digital conversion circuit 34 through the communication interface circuit 36, and are subjected to analog-to-digital conversion processing; then, the voltage and current values are transmitted to the remote control input circuit 37 via the communication interface circuit 36, and then calculated and processed by the central processing unit 31, and then outputted to the display circuit 35 and the remote control output circuit 38.
The safety protection system is controlled by a microcomputer or a microprocessor (such as the central processing unit), can monitor the operation condition of a power supply line accurately and online in real time, and when the problems of electric leakage, overload, short circuit, overvoltage, undervoltage and open phase occur to the lines in the three-dimensional wound core transformer and the intelligent control system, the safety protection system starts a protection program, sends an instruction to cut off the lines, and ensures the safety and stability of an electric system. In addition, the safety protection system can send out sound and light alarm when the circuit is cut off. Furthermore, the safety protection system can also be provided with a lightning protection function, protects electric equipment from being damaged by lightning, and is suitable for TT (neutral point direct grounding and equipment shell grounding), IT (all live parts are insulated and the equipment shell is grounded), TN-S (neutral point direct grounding, load zero-connecting protection, work zero line and protection line are strictly separated), TN-C-S (neutral point direct grounding, load zero-connecting protection, and the neutral line and the protection line of a part of lines in the system are combined into one) multiple power distribution systems.
In addition, the three-dimensional roll iron core intelligent transformer provided by the invention can collect and record the full-electric-quantity data of U (voltage), (current), P (power), COS phi (power factor), f (frequency), KWH (kilowatt-hour, active power), KVARH (kilowatt-hour, reactive power) and the like of each loop, collect signals of a breaker switching value, an abnormal alarm signal, non-electric quantity and the like, collect information of protection action information, event sequence recording information, working state of a protection device and the like, and provide a real-time main wiring diagram, a trend curve, a report, event sequence recording (SOE) and the like.
The three-dimensional roll iron core intelligent transformer provided by the invention has the following benefits to a power supply department:
1. can prolong the power supply radius of the substation and is suitable for long-distance power transmission of rural power grids
In a power grid with wide regions and dispersed power load, long-distance power transmission is always a difficult problem, a newly-built transformer substation is unreasonable in economy, and the power supply quality of a non-built transformer substation cannot meet the requirements. The three-dimensional iron core rolling intelligent transformer can well solve the problems, and can prolong the power transmission distance by times by adjusting the output voltage and improve the voltage quality of power supply.
2. The voltage qualification rate of the whole line can reach 100 percent
According to the line parameter calculation, the installation position and the setting parameter of the three-dimensional roll iron core intelligent transformer can be determined. The voltage of the whole line is simulated through self measurement and calculation of the three-dimensional roll iron core intelligent transformer, and the voltage of the whole line is ensured to reach the national standard after adjustment.
3. Can effectively reduce the line loss and the distribution transformer loss
Because the three-dimensional wound core transformer is adopted, the performance of the transformer is greatly improved compared with that of the traditional laminated distribution transformer, compared with an S9 type distribution transformer with the same capacity, the no-load loss is reduced by 44%, the load loss is reduced by 7%, the no-load current is reduced by 90%, the noise level is reduced by 13dB, and the energy-saving effect is obvious. Since the no-load current is reduced by 80%, the line loss is greatly reduced, and great economic benefit is brought to a power supply system.
4. The intelligent control system is put into or taken out of operation without power failure operation
The system can be matched with a specially designed combined bypass disconnecting link which is a combined execution disconnecting link for completing bypass and locking protection. Its function is to cut off the current route and to make other spare or mutual spare lines conduct, so that no live cutting or separation occurs. The design concept is ingenious, and the operation is flexible and simple. The transformer can be pushed out to operate without power failure during maintenance, and power failure operation is also not needed when the transformer is put into operation, so that the power supply reliability is improved.
5. The voltage can be automatically, manually or remotely adjusted according to the load of the line
The transformer can automatically calculate and adjust the far-end voltage according to the load of the line, and ensures that the line can accurately adjust the voltage no matter the line is in any running state such as three-phase three-wire, two-wire one-ground and the like.
The three-dimensional roll iron core intelligent transformer provided by the invention has the following benefits for enterprise users:
the running voltage of the control circuit is in the range of the economic running voltage, so that the loss of the user electric equipment can be reduced, the service life of the electric equipment is prolonged, and the unstable voltage condition of 'burning a motor in the daytime and burning a bulb at night' in the past is changed. The power saving effect is between 6% and 35% according to different electric loads.
The following two tables show measured data of energy consumption for adjusting the output side voltage, where:
table 1 shows data comparison before and after five plants use the intelligent transformer with a three-dimensional wound iron core of the present invention;
table 2 shows the power consumption and the plant power rate of each power consumption device after a certain plant uses the three-dimensional wound core intelligent transformer of the present invention.
Table 1 adjusts the actual measurement data of the energy consumption of factories with different voltages at the 10000 v output side, and the output voltages of the transformer are different, so that pages 86 and 87 of "practical power saving technology" with different active power saving effects are obtained.
| | Working condition | 1 | |
Working condition 3 |
| Start and end time of test | 9:0013:00 | 14:4518:45 | 7:0011:00 | |
| Factory 6KV voltage/kw | 5.755 | 5.996 | 6.207 | |
| |
119.773 | 120.667 | 120.055 | |
| Degree of transformation/kw.h of crystal factory | 38016 | 41496 | 44692 | |
| Low power plant transformation degree/kw.h | 1775.2 | 1825.2 | 1906 | |
| Electrical degree/kw.h of coal mill | 2848.4 | 3505.6 | 3358 | |
| Power/kw.h of powder discharging machine | 5875.2 | 1557.2 | 1393.6 | |
| Electric degree/kw.h of induced draft fan | 3560.8 | 3926.4 | 4309.6 | |
| Electric degree kw.h of blower | 4545.2 | 4660 | 4728 | |
| Electric degree kw.h of water supply pump | 7163.2 | 7385.2 | 7867.2 | |
| Power plant rate/%) | 7.97 | 8.597 | 9.307 | |
| Power consumption of feed pump% | 3.18 | 3.38 | 3.48 | |
| Percentage of power consumption after removal of mill and coal mill | 6.1 | 7.5 | 8.3 | |
| Condensate pump current/A | 410 | 398 | 378 | |
| 380V voltage/V for factory | 361.35 | 377.5 | 386.2 |
Table 2: actual measurement data of energy consumption at different 6000-volt voltages
"I", "II" and "III" in table 1 respectively represent "working condition after adjustment 1", "working condition after adjustment 2" and "III before adjustment", wherein "active power saving ratio" and "reactive power saving ratio" in "I" and "II" are for "III", and "power saving ratio" in table 1 can fully illustrate the technical effect of the present invention; table 2 shows that at different time intervals of each day, the voltage and the energy consumption are different, and intelligent operation is needed to achieve the best effect, which fully illustrates the technical effect of the invention, namely, optimizing power saving and maximizing power saving rate.
Energy conservation I: transformer with same specification and model, three-dimensional wound core and conventional laminated type contrast energy-saving
The performance of the S13 type three-dimensional wound core transformer is compared with that of transformers of various types:
1) compared with an S7 transformer with the same capacity, the no-load loss is reduced by more than 55%, the load loss is reduced by 33%, the no-load current is reduced by more than 85%, and the noise is reduced by 8-13 dB (A).
2) Compared with an S9 transformer with the same capacity, the no-load loss is reduced by more than 50%, the no-load current is reduced by more than 80%, and the noise is reduced by 8-11 dB (A).
3) Compared with an S11 transformer with the same capacity, the no-load loss is reduced by more than 25%, the no-load current is reduced by more than 70%, and the noise is reduced by 7-10 dB (A).
4) Compared with the S13 transformer with the same capacity and laminated structure, the transformer saves the silicon steel sheet consumption by more than 20 percent, the copper consumption by 2 to 3 percent, the no-load current by more than 50 percent and the noise by 4 to 6dB (A).
Energy conservation II: the intelligent control system is added on the three-dimensional reel iron core transformer, in the intelligent control system, the data acquisition circuit acquires signals, the control loop generates control signals according to the acquired signals and is used for controlling the action of the on-load tap changer, and the output voltage of the transformer operation is changed according to the action of the on-load tap changer, so that the lower end load of the transformer is always kept in an economic operation voltage range, the energy consumption is reduced, and the power consumption is greatly saved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides a two energy-conserving three-dimensional iron core intelligent transformer that rolls up which characterized in that includes: the three-dimensional wound iron core transformer and the intelligent control system;
the intelligent control system comprises an on-load tap changer, a control loop and a data acquisition circuit;
the voltage regulating coil tap of the high-voltage side of the three-dimensional wound core transformer is connected with the on-load voltage regulating switch, the on-load voltage regulating switch is connected with the control loop, and the control loop is connected with the data acquisition circuit.
2. The intelligent transformer with double energy-saving three-dimensional wound iron cores according to claim 1, wherein the control loop receives data output by the data acquisition circuit and generates a control signal for controlling the action of the on-load tap changer according to the data.
3. The intelligent transformer with double energy-saving three-dimensional wound iron cores according to claim 2, wherein when the data output by the data acquisition circuit shows that the output voltage of the intelligent transformer with three-dimensional wound iron cores is higher than a first threshold value, the control signal generated by the control loop is used for switching off the on-load tap changer so as to close the on-load tap changer with a lower gear; when the data output by the data acquisition circuit shows that the output voltage of the intelligent transformer with the three-dimensional roll iron core is lower than a second threshold value, the control signal generated by the control loop is used for breaking the on-load tap changer so as to close the on-load tap changer with a higher gear.
4. The intelligent transformer of claim 1, wherein the three-dimensional wound core transformer has a three-phase symmetrical three-dimensional structure, three core legs of the three-dimensional wound core transformer are arranged in an equilateral triangle three-dimensional manner, and three magnetic circuits have the same length.
5. The intelligent transformer with double energy-saving three-dimensional wound cores according to claim 1, further comprising a safety protection system, wherein the safety protection system is connected with the three-dimensional wound core transformer and the intelligent control system; when the three-dimensional wound core transformer and the line in the intelligent control system have the problems of electric leakage, overload, short circuit, overvoltage, undervoltage and open phase, the safety protection system starts a protection program for cutting off the line.
6. The intelligent transformer with double energy-saving three-dimensional wound iron cores according to claim 5, wherein the safety protection system comprises a central processing unit, a voltage signal feedback circuit, a current signal feedback circuit, an analog-to-digital conversion circuit, a display circuit, a communication interface circuit, a remote control input circuit and a remote control output circuit;
the voltage signal feedback circuit and the current signal feedback circuit are both connected with the three-dimensional wound core transformer and the intelligent control system;
the voltage signal feedback circuit and the current signal feedback circuit are both connected with the communication interface circuit, and the communication interface circuit is connected with the analog-to-digital conversion circuit;
the communication interface circuit is also connected with the remote control input circuit;
the remote control input circuit, the display circuit and the remote control output circuit are all connected with the central processing unit.
7. The intelligent transformer with double energy-saving three-dimensional wound cores according to claim 1, wherein a combined bypass knife switch is used with the intelligent control system.
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| CN116127240A (en) * | 2022-11-22 | 2023-05-16 | 西南交通大学 | Evaluation method for overload capacity of wound core of traction transformer |
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